Dwyer L4-SS Liquid Level Float Switch Spdt Stainless Steel

Product Description

The DWYER L4-SS is a stainless steel liquid level float switch designed for industrial and commercial fluid control applications. It uses a single pole, double throw (SPDT) float mechanism to detect liquid levels and trigger control actions such as pump activation, valve operation, or alarm annunciation. The unit accepts a 1-1/2 inch threaded connection, handles pressures up to 100 psi, and is rated for temperatures from 4 degrees F up to 275 degrees F. The stainless steel stem construction makes it suitable for use in corrosive or demanding process environments. Licensed plumbers, pipefitters, and instrumentation technicians are the primary installers of this type of device.

The L4-SS is used in a wide range of liquid level monitoring and control scenarios. Common applications include automatic tank dump operation, direct pump control for level maintenance, and level alarms in sumps, scrubber systems, hydro-pneumatic tanks, boilers, and water and wastewater treatment processes. It is also used for valve control in both residential and industrial-scale systems wherever a reliable mechanical float switch with a threaded tank or vessel connection is required.

Key Features

• SPDT switch logic allows use in both normally open and normally closed control circuits
• 1-1/2 inch threaded connection for direct installation into tanks, vessels, or pipe tees
• Rated to 100 psi and 275 degrees F for high-temperature and pressurized system use
• Stainless steel stem construction resists corrosion in process fluid environments
• Float specific gravity of 0.7 suitable for water and similar low-viscosity liquids
• Float diameter of 1.63 inches provides reliable actuation in tight vessel installations

Compatibility

Designed for use in sumps, scrubber systems, hydro-pneumatic tanks, boilers, and water and wastewater treatment processes where a 1-1/2 inch threaded float switch with SPDT output is required.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or instrumentation technician in accordance with applicable local codes and the system manufacturer's requirements. Depressurize and drain the vessel or tank completely before installing or removing the float switch. Ensure the thread type and sealant are compatible with the process fluid before making up the threaded connection. Verify switch wiring conforms to NEC requirements for the control voltage and load being switched.